Superconductivity at nanoscale

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1 Superconductivity at nanoscale

2 Superconductivity is the result of the formation of a quantum condensate of paired electrons (Cooper pairs). In small particles, the allowed energy levels are quantized and for sufficiently small particle sizes the mean energy level spacing becomes bigger than the superconducting energy gap. It is generally believed that superconductivity is suppressed at this point (the Anderson Criterion) Q: Is superconductivity important for nano-devices? In which way superconductivity manifests itself at nanoscale? Superconductivity in Nanosystems 2

3 Generally, Tunneling in superconductors Superconductivity in Nanosystems 3

4 At the S-N interface, S N S N No single-electron tunneling possible until I Δ V Superconductivity in Nanosystems 4

5 Then, how the charge is transferred between the superconductor and normal metal? In a a normal metal ε Hole branch Fermi level p Electron-hole representation Hole-like excitation Superconductivity in Nanosystems 5

6 In a superconductor, An electron can be reflected as a hole with opposite group velocity. In this way the charge 2e is transferred Andreev reflection Superconductivity in Nanosystems 6

7 Reflected Transmitted Incident An electron (red) meeting the interface between a normal conductor (N) and a superconductor (S) produces a Cooper pair in the superconductor and a retroreflected hole (green) in the normal conductor. Vertical arrows indicate the spin band occupied by each particle. Superconductivity in Nanosystems 7

8 In the presence of the tunneling barrier the Andreev reflection contains an extra tunneling amplitude. However, at exponentially. the single-particle tunneling is suppressed Andreev reflection is a way to bring Cooper pairs to a superconductor from a normal conductor in a coherent way. For a perfect (non-reflecting) interface the probability of Andreev reflection is 1. e Cooper pair In general case both reflection channels normal and Andreev have finite probabilities. e h Superconductivity in Nanosystems 8

9 Normal Reflection in an N/S Phase Boundary between semi-infinite N and S Layers Total Andreev Reflection in an N/S Phase Boundary between semiinfinite N and S Layers Superconductivity in Nanosystems 9

10 Superconductivity in Nanosystems 10

11 Parity effect How much we pay to transfer N electrons to the box? Coulomb energy: We have taken into account that the electron charge is discrete. Superconductivity in Nanosystems 11

12 We have arrived at the usual diagram for Coulomb blockade at some values of the gate voltage the electron transfer is free of energy cost! Superconductivity in Nanosystems 12

13 What happens in a superconductor? Energy depends on the parity of the electron number! Parity effect: Superconductivity in Nanosystems 13

14 The ground state energy for odd n is Δ above the minimum energy for even n Superconductivity in Nanosystems 14

15 Experiment (Tuominen et al., 1992, Lafarge et al., 1993) Coulomb blockade of Andreev reflection The total number of electrons at the grain is about However, the parity of such big number can be measured. Superconductivity in Nanosystems 15

16 Stability diagram of Cooper pair box By Hergenrother et al., 1993 SET Superconductivity in small systems manifests itself through energy scales of current-voltage curves Superconductivity in Nanosystems 16

17 Crossover from 2e periodicity to e periodicity can be observed in external magnetic field suppressing superconductivity Observed in S -S-S systems, where the physics of Coulomb blockade is similar Superconductivity in Nanosystems 17

18 How one can convey Cooper pairs between superconductors? Superconductivity in Nanosystems 18

19 Stationary Josephson effect S I V S Weak link two superconductors divided by a thin layer of insulator or normal conductor What is the resistance of the junction? For small currents, the junction is a superconductor! Reason order parameters overlap in the weak link B. Josephson Superconductivity in Nanosystems 19

20 S Amplitude S Since superconductivity is the equilibrium state, the overlap leads to the change in the Gibbs free energy. This energy difference is sensitive to the phase difference of the order parameter (the order parameter is complex). We will show that it leads to the persistent current through the junction the Josephson effect. Superconductivity in Nanosystems 20

21 To calculate the current let us introduce an auxiliary small magnetic field with vector potential δa which penetrates the junction. Then Superconductivity in Nanosystems 21

22 Superconductivity in Nanosystems 22

23 Josephson interferometer (after intergration) Denote: Most sensitive magnetometer - SQUID Superconductivity in Nanosystems 23

24 Josephson junctions in magnetic field y Narrow junction > H= const 1 2 x Penetrated regions Therefore Superconductivity in Nanosystems 24

25 In a wide junction the magnetic field created by the Josephson current becomes important. Then H and A become dependent on z From the Maxwell equation Ferrel-Prange equation Josephson penetration length Josephson vortices Distribution of current in narrow and wide contacts (fluxons) Superconductivity in Nanosystems 25

26 Non-stationary Josephson effect Due to the gauge invariance the electric potential in a superconductor can enter only in combination Thus, the phase acquires the additional factor Here θ is the phase difference while V is voltage across the junction. Superconductivity in Nanosystems 26

27 Thus, is the voltage V is kept constant, then where is the Josephson frequency This equation allows to relate voltage and frequency, which is crucial for metrology. Superconductivity in Nanosystems 27

28 Dynamics of a Josephson junction: I-V curve A particle with In a washboard potential Superconductivity in Nanosystems 28

29 Macroscopic quantum tunneling A macroscopic Josephson junction can escape from its ground state via quantum tunneling like the α-decay in nuclear physics. Quantum effects were observed through the shape of an I-V curve Superconductivity in Nanosystems 29

30 Josephson junction in an a. c. field Important application detection of electromagnetic signals Suppose that one modulates the voltage as Then Superconductivity in Nanosystems 30

31 Then one can easily show that at a time-independent step appears in the I-V-curve, its amplitude being Shapira steps Superconductivity in Nanosystems 31

32 Applications Superconductivity in Nanosystems 32

33 Superconductivity in Nanosystems 33

34 Main Applications Metrology, Volt standard High frequency applications Magnetometers, SQUIDs Amplifiers, SQUIDs Imaging, MRI, SQUIDs Superconductivity in Nanosystems 34

35 Medicine, biophysics and chemistry Biomagnetism Biophysics: - Diagnostics by magnetic tagging of antibodies -Special frequency characteristics, no rinsing MRI (Magetic Resonance Imaging) - Low frequency, low noise amplifiers, sc solenoids NMR (Nuclear Magnetic Resonance) -Low frequency, small fields, sc solenoids NQR (Nuclear Quadropole Resonance) - Low frequency, low noise amplifiers, sc solenoids Superconductivity in Nanosystems 35

36 Superconductivity in Nanosystems 36

37 Superconductivity in Nanosystems 37

38 Superconductivity in Nanosystems 38

39 Superconductivity in Nanosystems 39

40 Superconductivity in Nanosystems 40

41 Superconductivity in Nanosystems 41

42 Superconductivity in Nanosystems 42

43 Summary Andreev reflection allows coherent transformation of normal quasiparticles to Cooper pairs. Cooper pairs can be transferred through tunneling barriers via Josephson effect. Coulomb blockade phenomena manifest themselves as specific parity effect in superconductor grains. Manipulation Cooper pairs allow devices of a new type, e. g., serving as building blocks for quantum computation Superconductivity in Nanosystems 43

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